Hi Henry,
You might try a do case statement something like:
If mCode = "5B" &&then check the age
do case
case between(the_age,1,54)
use mCode
case between(the_ age,55,64)
use code "7B"
case btween(the_age,65,74)
use Code "6B"
case the_age >= 75
use code "1B"
otherwise
some error message
endcase
Endif